**Sphere Calculator**

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## Definition

**Sphere** is a three dimensional (3D) geometrical shape that is like a round ball. Geometrically, it is a shape which has infinite points at a distance r (radius) from a point. Variuos features of a sphere are as below:

**Radius:**is the distance from the centgre of the sphere to the edge of the sphere.**Diameter:**is the longest straight line that can be drawn from one point on the surface of the sphere to another point on the sphere. It passes though the center of the sphere.

## Formula

** Surface Area: **This is calculated by the formula:

**4 * π * Radius²**

** Volume: **This is calculated by the formula:

**4/3 * π * Radius³**

** Diameter: **Diameter is twice the radius of the circle and hence:

**2* Radius**

** π (Pi): **This is the ratio of Circumference of the circle to the Diameter of the circle. This is usually represented by the symbol

**π**and has a value of 3.14159…

## Units: Measurement units

** Meter (m): **is the base unit of length in the International System of Units (SI). Metre is defined as the distance travelled by light in a specific fraction (1299 792 458) of a second.

** Other SI units:** are millimeter (mm) ie 1/1000 of m, centimeter (cm) which is 1/100 of m and kilometer (km) which is equal to 1000m.

__Other English units of measure of distance are__:

** Mile**: An English unit of length, it is equal to 1609 meters (m).

__: It is equal to 0.9144 meters (m).__

**Yard**__: It is equal to 0.3048 meters (m).__

**Foot**